Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/libs/buzzer.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef __BUZZER_H__
-#define __BUZZER_H__
+#pragma once
 
 #include "../inc/MarlinConfig.h"
 
@@ -123,5 +121,3 @@ class Buzzer {
   #define BUZZ(d,f) NOOP
 
 #endif
-
-#endif

Marlin/src/libs/circularqueue.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef __CIRCULARQUEUE_H__
-#define __CIRCULARQUEUE_H__
+#pragma once
 
 #include <stdint.h>
 
@@ -141,5 +139,3 @@ class CircularQueue {
       return this->buffer.count;
     }
 };
-
-#endif

Marlin/src/libs/hex_print_routines.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef HEX_PRINT_ROUTINES_H
-#define HEX_PRINT_ROUTINES_H
+#pragma once
 
 #include <stdint.h>
 
@@ -46,5 +44,3 @@ void print_hex_address(const void * const w);
 #else
   typedef uint16_t ptr_int_t;
 #endif
-
-#endif // HEX_PRINT_ROUTINES_H

Marlin/src/libs/least_squares_fit.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Incremental Least Squares Best Fit  By Roxy and Ed Williams
@@ -32,9 +33,6 @@
  *
  */
 
-#ifndef _LEAST_SQUARES_FIT_H_
-#define _LEAST_SQUARES_FIT_H_
-
 #include "../inc/MarlinConfig.h"
 #include <math.h>
 
@@ -83,5 +81,3 @@ void inline incremental_LSF(struct linear_fit_data *lsf, const float &x, const f
 }
 
 int finish_incremental_LSF(struct linear_fit_data *);
-
-#endif // _LEAST_SQUARES_FIT_H_

Marlin/src/libs/nozzle.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef __NOZZLE_H__
-#define __NOZZLE_H__
+#pragma once
 
 #include "../inc/MarlinConfig.h"
 #include "point_t.h"
@@ -90,5 +88,3 @@ class Nozzle {
 
   #endif
 };
-
-#endif // __NOZZLE_H__

Marlin/src/libs/private_spi.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef __PRIVATE_SPI_H__
-#define __PRIVATE_SPI_H__
+#pragma once
 
 #include "softspi.h"
 #include <stdint.h>
@@ -53,5 +51,3 @@ class SPIclass<MISO_PIN, MOSI_PIN, SCK_PIN> {
     }
 
 };
-
-#endif // __PRIVATE_SPI_H__

Marlin/src/libs/stopwatch.h

@@ -19,9 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-
-#ifndef STOPWATCH_H
-#define STOPWATCH_H
+#pragma once
 
 // Print debug messages with M111 S2 (Uses 156 bytes of PROGMEM)
 //#define DEBUG_STOPWATCH
@@ -116,5 +114,3 @@ class Stopwatch {
 
     #endif
 };
-
-#endif // STOPWATCH_H